Flo Alternatives: Honest Options, Including the Ones That Are Not Apps

There is no single Flo alternative, because people leave for four different reasons and each one points somewhere else. If you are leaving over privacy, the replacement is an app whose design keeps the log on your phone. If you are leaving because of the feed of articles and prompts, the replacement is a quieter app, which is a question of taste rather than of policy. If you are leaving because you regret the account, the work is to delete the account before you delete the app, and the app you move to barely matters. And if you are leaving over cost, this page will disappoint you, because it does not print prices. Work out which of the four you are and the rest of this article gets much shorter.

One rule holds everywhere below. Every sentence about a named app comes from that company's own published document, and it is written as reported speech, because that is the only kind of statement anybody can check. Where a reader would want a fact that no published document gives, this page says so rather than filling the gap.

Work out which reason is yours

• Cost. A search for a free Flo alternative is a search for a price, and prices move. No page that was written once can tell you what any app costs this morning; the store listing is the only current answer, and it is the one to trust over anything written here or anywhere else.
• The feed. Some people want a tracker and get a magazine. That is a preference, not a failing, and nothing in a privacy policy will tell you whether an app feels noisy. The only test is using it.
• The account. If what you regret is having signed up, changing apps does nothing on its own. The account is a separate object from the app on your phone, and it outlives the icon you delete.
• Privacy. This is the reason with an actual answer, because it is the only one that turns on how an app is built rather than on how it feels. It is also the reason most of this page is about.

The reason matters because the four answers conflict. The quietest app may hold the most data. The app that holds nothing may be the one with the fewest features. Somebody who leaves for one reason and picks a replacement suited to another has done a lot of typing for nothing.

What Flo publishes about itself

A fair alternatives page states what you are leaving in the words of the company you are leaving, so here it is. Flo's privacy policy, effective 9 April 2026, states that it does not sell or rent personal data for money, and that it will not use information from Apple HealthKit or Google Health Connect for advertising or sell it to advertising platforms, data brokers or resellers. The same policy states that an account can be deleted in the app's settings, that a deletion request is handled within one month, and that complete deletion from backup systems may take 90 days and cannot be undone once it has begun.

Flo also publishes a feature called Anonymous Mode. Flo describes it as a way to track your health without your name, email, IP address or any other identifier being linked to your health data, routed through an Oblivious HTTP relay so that the relay sees the IP address but not the health data while Flo sees the health data but not the identity. Flo states that even Flo cannot identify individuals using it.

That is the company's account of itself, and this site has no way to test it. Nobody outside a company can inspect its servers, and a privacy policy is a promise about behaviour rather than a fact about architecture. What can be checked is the public record on either side of it. In 2021 the US Federal Trade Commission announced a settlement with the developer of a widely used fertility-tracking app; the FTC's complaint alleged that the company promised to keep users' health data private while disclosing it to third-party analytics providers, and the company settled, neither admitting nor denying the allegations, and agreed to obtain express consent before sharing health data in future. Against that, when the UK's Information Commissioner's Office reviewed period and fertility apps in 2024, it reported that no serious compliance issues or evidence of harms were identified, while urging developers to prioritise privacy. Both belong in the same paragraph, and neither is a verdict.

The field, in each company's own words

Clue. Clue's privacy policy, last updated 14 July 2026, states that creating a Clue account processes personal data such as a username, date of birth and email address, that all data is securely stored on servers located in the European Union, that profile data is stored separately from health data, that the health data tracked in the app is never shared with or sold to advertisers, and that a request for complete deletion of your data is actioned within one month. If you want a fuller side-by-side of the two documents, what Flo and Clue each publish about your data is set out on its own page.

drip. The drip privacy policy states that there is no collection of usage data or personal information, no ads and no spyware; that menstrual cycle data is stored locally on the device and cannot be accessed by other apps; that deleting the app data in settings or uninstalling removes it; and that the source code can be read to check that all of this is true. The policy carries its own caveat, and it is an important one: an automatic cloud backup may still take place depending on your device settings. Local storage is not the same thing as local storage plus a phone backup you configured two years ago and forgot.

Euki. Euki's privacy policy, effective June 2024, states that it does not collect any personal or other information from users, including through their use of the app, except for information a user voluntarily sends by contacting support, and that the app does not track its users to provide targeted advertising.

Apple's Cycle Tracking. If you have an iPhone, one option is already installed. Apple's guide says you can log menstrual cycle information to get period and fertile window predictions, and that the log covers period days, flow level, symptoms, spotting, basal body temperature and more; it adds that an Apple Watch can be used to help log it, and that on supported models Siri can log a period start.

Paper. The oldest option is the only one with no policy to read, because there is no company. A sheet of paper cannot be synced, breached, sold or subpoenaed, and it does not need updating. The printable period tracker on this site produces one in A4 or US Letter. Its weakness is the obvious one: it does no arithmetic, and it burns.

The question this page will not answer

Which of them is best. Not out of politeness, but because the honest inputs do not exist. Ranking companies by trustworthiness would mean testing claims nobody outside them can test, and the ranking would be a guess dressed up as a service. What can be laid out is what each one publishes and what regulators have recorded, which is what the sections above are.

Cost is refused for a different reason. Prices change, regional pricing differs, and a page that named a figure would be wrong within a year and would still be sitting there being wrong. Whatever an app costs, its own store listing is the only current answer.

What moving actually costs you

Two things, and neither is obvious until it happens.

The first is your history. Cycle history is the only input any prediction has, and a new app starts with nothing. Export from the old app before you delete anything, and keep the file somewhere you will find it again. If the export lands as a spreadsheet you cannot easily read, the start dates are the part that matters: feed the last few into the cycle length calculator and it will tell you your own average and how much it moves, which is the number a new app spends months rediscovering. The period calculator then turns that into a window with the uncertainty printed next to it, so you are not flying blind while the new app catches up.

The second is the account you left behind. Deleting an app removes the copy on your phone; if there was an account, the copy on the company's servers stays where it is until you ask for it to go. That is a different action, taken in a different place, and it is worth doing in the right order — export, then delete the account, then delete the app. What deleting the app does and does not remove goes through it properly, and how to delete period tracker data covers the request itself.

The test that beats any comparison page

Turn the connection off. Put the phone in airplane mode and use the app for a day. If logging, history and predictions all still work, the arithmetic is happening on the device. If it stalls, it is not. That is one afternoon of your own evidence, and it outranks every claim on this page including the ones about Athena. The difference between a promise and an architecture is the longer version of that argument.

Where Athena stands

Athena is the app this site is being built for, and it is honest to say plainly that it is not yet an alternative to anything. It is in development, it is not in any store, nothing here is for sale and there is nothing to sign up for. What exists today is the free tools on this site, which run in your browser, and the writing.

When it ships, the design is the on-device one: cycle data written to a private database on the phone, predictions calculated on the device, no account and no server copy of health data. Two things do leave. The app will send anonymous diagnostics — which features get used, crashes, device model — to Firebase, and never anything you log. This website uses IP-anonymised web analytics. Saying an app sends nothing at all when it sends diagnostics would be the same kind of sentence this page exists to avoid.

Local-only has a cost too, and it is the mirror image of the one above. There is no automatic backup. If the phone is lost and nothing was exported, the history is gone, and no support email will bring it back. That trade is the whole point of the architecture, and it is not free.

Two pages take the same question from other angles. If the objection is the money or the advertising rather than the data, the trackers without a subscription and the ones without ads set out what each company publishes about its own model. And if you want the argument for reading the code instead of the policy, it is in open-source period trackers.